this weekend. never feel the annual convention is here and the japanese animations convention means a big boost for the local economy. >> reporter: it is hard to tell who is more excited, the conventioners. >> this is a grit place. go baltimore. >> reporter: or behind the counter. >> it has been well. >> oh, a lot of money. a lot of money my. >> they flock to the inner harbor. they eat at the restaurant and buy goods at the shops. they like to bring something back home from baltimore. >> reporter: the website boosts that since 1999, they have taken over a sizable chunk of the inner harbor for a three day festival. last year, 30,000 people attended. they have hand over a sizable chunk of money in return. average of $15 million a year, including filling 4600 hotel rooms in the surrounding area. >> one oour busiest day of the year. >> reporter: whether it is soft drinks, food, or the security guards. they love baltimore. >> if i would have to choose the best vacation. this is it every year. >> reporter: and baltimore loves it right back. >> this is special. it create as puz around the city.